16.	A
	This reading shows the enemy's altitude in units of 1,000 feet.
17.	I
	This indicates the compass angle at which you must fly in order to intercept the enemy.  Use the I indicator reading in conjunction with the compass reading on your Head-Up display.  For example, if your I indicator is reading 240, steer your aircraft so that your compass also reads 240.
18.	S
	This shows the enemy's speed in miles per hour.
19.	HORIZONTAL RADAR SCREEN
	Below the Enemy Data Display is a large green square.  This is your horizontal radar screen.  Your position is represented by the "+" symbol.  The enemy aircraft is represented by the moving yellow square.

20.	CIRCULAR RADAR SCREEN
	To the left of the Hortizontal Radar is a dark green circle on a black field.  This is your Circular Radar Screen.  It shows an overhead view of the situation.  Even if the enemy is invisible on the horizon and on the Horizontal Radar, he could be directly overhead if he appears as a blue dot on the Circular Radar Screen.  If you allow him to stay there you'll be attacked.  To get out of this spot, bank your aircraft 90 degrees, then bank sharply and rapidly to the right and left.